10 days is the minimum, even for PG only. At least, that was what Jumbo Moore (Kambako Safaris) stated when I inquired a couple years ago.

I seriously considered a Safari with Kambako, but the requirement for a license fee (separate from trophy fee) for each species desired to hunt didn't appeal to me. Whether successful or not (or even if not actively hunted during the safari) there's no refunds on the license fee.